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110 lines
4.2 KiB
Markdown
110 lines
4.2 KiB
Markdown
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# DeskTop diassembly notes
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## DESKTOP.SYSTEM
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A short (8k) loader program. This is likely responsible for copying
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the rest to a RAM card (if available), then invoking the main app.
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## DESKTOP2.$F1
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This is large - 111k. It includes a loader, the DeskTop app (with both
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main memory and aux memory segments, filling everything from $4000 to
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$FFFF (except for I/O space and ProDOS), and still having more code -
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probably the disk copy code which is swapped in dynamically.
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The file is broken down into multiple segments:
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* segment 0: load - offset $0000, length $0580, loaded at $2000
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* segment 1: aux1 - offset $0580, length $8000, loaded at $4000 (through $BFFF)
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* segment 2: aux2 - offset $8580, length $1D00, loaded at $D000 (through $ECFF)
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* segment 3: aux2 - offset $A280, length $0500, loaded at $FB00 (through $FFFF)
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* segment 4: main - offset $A780, length $7F00, loaded at $4000 (through $BEFF)
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* main $BF00-$BFFF is ProDOS buffers
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* main $C000-$CFFF is I/O space
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* main $D000-$FFFF is ProDOS
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* segment 5: _TBD_ - 38k so must be further subdivided. Disk Copy???
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## Structure
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### GUI Library "A2D"
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AUX $4000-$8DFF is the GUI library used for the DeskTop application
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and (presumably) for disk copy and Selector apps (TBD).
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Entry point is $4000 with a ProDOS MLI-style calling convention
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* Font is at $8800
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### "DeskTop" Application
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DeskTop application code is in the lower 48k of both Aux and Main:
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* Aux $8E00-$BFFF - sitting above the GUI library
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* Main $4000-$BEFF
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And in the Aux language card area (accessible from both aux and main code) are relays, buffers and resources:
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* Aux $D000-$ECFF - relays and other aux/main helpers, resources (menus, strings, window)
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* Aux $ED00-$FAFF - hole for data buffer
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* Aux $FB00-$FFFF - more resources (file types, icons)
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($C000-$CFFF is reserved for I/O, and main $BF page and language card is ProDOS)
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```
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Main Aux ROM
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$FFFF +------------+ +------------+ +------------+
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| ProDOS | | DeskTop | | Monitor |
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$F800 | | | Resources/ | +------------+
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| | | Buffers | | Applesoft |
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$D000 +------------+ +------------+ +------------+ +------------+
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| I/O |
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$C000 +------------+ +------------+ +------------+
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| ProDOS | | DeskTop |
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$BF00 +------------+ | App Code |
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| DeskTop | | |
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| App Code | | |
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$8E00 | | +------------+
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| | | A2D GUI |
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| | | Library |
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$4000 +------------+ +------------+
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| Graphics | | Graphics |
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$2000 +------------+ +------------+
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| Desk Acc | | Desk Acc |
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$0800 +------------+ +------------+
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| Text | | Text |
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$0400 +------------+ +------------+
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$0300 +------------+ +------------+
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| Input Buf | | Input Buf |
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$0200 +------------+ +------------+
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| Stack | | Stack |
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$0100 +------------+ +------------+
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| Zero Page | | Zero Page |
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$0000 +------------+ +------------+
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```
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